112 lines
3.9 KiB
C
112 lines
3.9 KiB
C
/*
|
|
* SpanDSP - a series of DSP components for telephony
|
|
*
|
|
* private/v17tx.h - ITU V.17 modem transmit part
|
|
*
|
|
* Written by Steve Underwood <steveu@coppice.org>
|
|
*
|
|
* Copyright (C) 2004 Steve Underwood
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public License version 2.1,
|
|
* as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id: v17tx.h,v 1.2.4.1 2009/12/24 16:52:30 steveu Exp $
|
|
*/
|
|
|
|
/*! \file */
|
|
|
|
#if !defined(_SPANDSP_PRIVATE_V17TX_H_)
|
|
#define _SPANDSP_PRIVATE_V17TX_H_
|
|
|
|
/*! The number of taps in the pulse shaping/bandpass filter */
|
|
#define V17_TX_FILTER_STEPS 9
|
|
|
|
/*!
|
|
V.17 modem transmit side descriptor. This defines the working state for a
|
|
single instance of a V.17 modem transmitter.
|
|
*/
|
|
struct v17_tx_state_s
|
|
{
|
|
/*! \brief The bit rate of the modem. Valid values are 4800, 7200 and 9600. */
|
|
int bit_rate;
|
|
/*! \brief The callback function used to get the next bit to be transmitted. */
|
|
get_bit_func_t get_bit;
|
|
/*! \brief A user specified opaque pointer passed to the get_bit function. */
|
|
void *get_bit_user_data;
|
|
|
|
/*! \brief The callback function used to report modem status changes. */
|
|
modem_tx_status_func_t status_handler;
|
|
/*! \brief A user specified opaque pointer passed to the status function. */
|
|
void *status_user_data;
|
|
|
|
/*! \brief The gain factor needed to achieve the specified output power. */
|
|
#if defined(SPANDSP_USE_FIXED_POINT)
|
|
int32_t gain;
|
|
#else
|
|
float gain;
|
|
#endif
|
|
|
|
/*! \brief The route raised cosine (RRC) pulse shaping filter buffer. */
|
|
#if defined(SPANDSP_USE_FIXED_POINT)
|
|
complexi16_t rrc_filter[2*V17_TX_FILTER_STEPS];
|
|
#else
|
|
complexf_t rrc_filter[2*V17_TX_FILTER_STEPS];
|
|
#endif
|
|
/*! \brief Current offset into the RRC pulse shaping filter buffer. */
|
|
int rrc_filter_step;
|
|
|
|
/*! \brief The current state of the differential encoder. */
|
|
int diff;
|
|
/*! \brief The current state of the convolutional encoder. */
|
|
int convolution;
|
|
/*! \brief The code number for the current position in the constellation. */
|
|
int constellation_state;
|
|
|
|
/*! \brief The register for the data scrambler. */
|
|
uint32_t scramble_reg;
|
|
/*! \brief Scrambler tap */
|
|
//int scrambler_tap;
|
|
/*! \brief TRUE if transmitting the training sequence. FALSE if transmitting user data. */
|
|
int in_training;
|
|
/*! \brief TRUE if the short training sequence is to be used. */
|
|
int short_train;
|
|
/*! \brief A counter used to track progress through sending the training sequence. */
|
|
int training_step;
|
|
|
|
/*! \brief The current phase of the carrier (i.e. the DDS parameter). */
|
|
uint32_t carrier_phase;
|
|
/*! \brief The update rate for the phase of the carrier (i.e. the DDS increment). */
|
|
int32_t carrier_phase_rate;
|
|
/*! \brief The current fractional phase of the baud timing. */
|
|
int baud_phase;
|
|
|
|
/*! \brief A pointer to the constellation currently in use. */
|
|
#if defined(SPANDSP_USE_FIXED_POINT)
|
|
const complexi16_t *constellation;
|
|
#else
|
|
const complexf_t *constellation;
|
|
#endif
|
|
/*! \brief The current number of data bits per symbol. This does not include
|
|
the redundant bit. */
|
|
int bits_per_symbol;
|
|
/*! \brief The get_bit function in use at any instant. */
|
|
get_bit_func_t current_get_bit;
|
|
/*! \brief Error and flow logging control */
|
|
logging_state_t logging;
|
|
};
|
|
|
|
#endif
|
|
/*- End of file ------------------------------------------------------------*/
|